Queensland Parliament's ethics committee will recommence an investigation into whether Redcliffe MP Scott Driscoll failed to declare all of his pecuniary interests.

The committee suspended its inquiry earlier this year, pending investigations by police and the Crime and Misconduct Commission (CMC) into Mr Driscoll's family business dealings.

Mr Driscoll has denied any wrongdoing.

But after receiving independent legal advice that the other investigations wouldn't be compromised, the parliamentary committee has decided to resume its inquiry.

It has also decided to start investigating a claim by the deputy president of the Queensland Industrial Relations Commission that Mr Driscoll misled Parliament about his role with a retail lobby group.

In light of the legal advice on those matters, the committee is also considering reopening investigations into three matters concerning former Transport Department director-general Michael Caltabiano.

He is also accused of misleading Parliament and is facing a CMC investigation.